They are not after github
They are after all the personal data and interrelations, plus the business info of who they can sell their shit to.
Then they will gradually leverage thier own personnel into top opensource projects, get control of the direction and use the hundreds of thousands of contributors as slave labour.
They set the direction .... You do the work.
Then you can bet there will be the EULA that will be changed over time.
They made it clear in 2010 they WANT linux or they want it DEAD. that was why they probably funded SCO against IBM